Apparatus for tamping and for breaking concrete and masonry



y 1965 w, v. CORNETT I 3,181,627

' APPARATUS FOR TAMPING AND FOR BREAKING CONCRETE AND MASONRY Filed Nov. 22. 1961 2 Sheets-Sheet l f f2 T Z 23 5? 22 7 32' 3/ e in INVENTOR. #41175? I! 605N677 y 1965 w. v. CORNETT 3,181,627

APPARATUS FOR TAMPING AND FOR BREAKING CONCRETE AND MASONRY Filed Nov. 22. 1961 .2 Sheets-Sheet 2 INVENTOR. W417i? 1- 606M677 Arron [rs United States Patent 3,181,627 APPARATUS FOR TAMPING AND FOR BREAK- LNG CONCRETE AND MASONRY Walter V. Cornett, 2751 E. 11th St., Los Angeles 23, Calif. Filed Nov. 22, 1961, Ser. No. 154,120 9 Claims. (Cl. 173-100) The present invention is directed to an apparatus which is adapted for use in tamping, breaking concrete and masonary, and other purposes.

In co-pending application Serial No. 70,329, filed November 18, 1960, now abandoned, and entitled Device for Breaking Pavement, there has been described an apparatus of this type which has proven to be quite successful. However, in practice, it is desirable to perform additional functions and particularly to provide an apparatus which is capable of effective operation below the surface on which the apparatus operates, and particularly in trenches or other depressed areas.

According to the invention, the apparatus is mounted on a vehicle of a suitable type having a vertical support, usually in the form of a frame, on which a shroud is mounted, the shroud being operable usually by a hydraulic cylinder to move it vertically up and down. A tool holder is pivoted on the shroud and it carries a relatively long arm, usually consisting of a series of fiat springs at the free end of which a tool such as a hammer, tamper or the like is held. The tool holder is so connected to a work cyl inder for the hammer, which also is mounted on the shroud, that the necessary reciprocating motion for operation of the hammer is imparted to the tool holder.

In addition to the movements outlined above, the apparatus is supplied with means for laterally oscillating the shroud so that the tool may operate on a trench of various widths. The shroud is so mounted on the vertical support that it may oscillate relative thereto by a hydraulic swing cylinder connected to the frame of the vehicle and to the shroud.

In the accompanying drawings constituting a part hereof, in which like reference characters indicate like parts,

FIG. 1 is front elevational view of a tamping apparatus made in accordance with the present invention;

FIG. 2 is a side elevational view thereof, some parts being shown in section for clearness;

FIG. 3 is a side elevational view of the spring arm and hammer, and

FIG. 4 is a horizontal cross-sectional view taken along line 44 of FIG. 2.

The frame which is mounted on the vehicle consists essentially of a pair of spaced-apart horizontal channel members 1 connected together at top and bottom by cross members 2 and 3. On cross member 2 is a tube 4 which acts as a hanger for a hydraulic cylinder and is secured to member 2 by bolts 5.

At the top of tube 4 is a suspension rod 6 held at 7 in tube 4. The upper end 8 of hydraulic lifting cylinder 9 is pivoted on bar 6. Opening 10 constitutes a connection for hydraulic fluid to be introduced into the cylinder and opening 12 constitutes a connection for a reverse flow of hydraulic fluid. In the cylinder is a piston 13 having a piston rod 14 extending downwardly and pivoted in yoke 15 by pin 16. The yoke is secured to the top of push rod 17. A push rod casing 18 surrounding the push rod has its ends in contact with and secured to cross members 2 and 3 at points 19 and 20, respectively.

The shroud consists of a pair of parallel plates 22 and 23, said plates being connected together as shown at 24 in FIG. 4. A shroud hanger 25 from the upper end of the shroud extends around and embraces casing 18 and is 3,181,627 Patented May 4, 1965 vertically slidable thereon. Similarly a shroud hanger 26 extends from the lower end of the shroud and is connected to the lower end of push rod 17 by plate 27 and bolts 28 and 29.

Between plates 22 and 23 there is journaled at 31 and 32 respectively, a trunnion 33 on which is mounted tool holder 34. One end of spring arm 35 is anchored in the tool holder and it carries at its free end a hammer head 36 secured by brackets 37. Operating tool 38 is held in hammer head 36.

Hydraulic hammer cylinder 41 is pivoted to plates 22 and 23 at the upper ends thereof by bearings 42 in which are stub shafts 43.

Piston 44 in cylinder 41 has piston rod 45 linked at 46 to brackets 47 on tool holder 34. The distance between trunnion 33 and pivot 46 constitutes a lever whereby the operation of the hammer cylinder will raise and lower the hammer to cause it to impact on the desired area. Suitable connections for hydraulic fluid 48 and 49 are provided for cylinder 41.

Lever 51 fixed on tool holder 34 is linked at 52 to a mechanism which is no part of the apparatus claimed herein.

As shown in FIGS. 1 and 4, means are provided for laterally swinging the shroud assembly about casing 18. Bracket 56 on channel 1 has universally pivoted thereto the free end of piston rod 57 which carries a piston operating in swing cylinder 58. The end of said cylinder remote from the piston rod is pivoted on and is vertically slidable on a vertical rod 59, held fixedly in brackets 60 fixed to plate 22. Suitable connections 61 and 62 for hydraulic fluid are provided for cylinder 58. When the shroud assembly is swung around its vertical axis, the piston 13, rod 14 and the push-rod 17 will, of course, be rotatively moved.

I claim:

1. An apparatus for tamping and other purposes comprising a frame, a vertical support on said frame, a shroud slidably connected to said support, a shroud cylinder on said support, a piston and rod in said shroud cylinder, said rod being operatively connected to said shroud, whereby the shroud is movable vertically, a swing cylinder having a piston and rod therein, said swing cylinder and rod being respectively pivoted to said shroud and frame, said shroud being swingable laterally about said support, a hammer holder mounted on said shroud, said holder being on a horizontal pivot for vertical movement, a bracket fixed to said holder and extending on the opposite side of said horizontal pivot from said holder, a hammer cylinder having a piston and rod, said hammer cylinder and rod being pivoted respectively to said bracket and said shroud, said holder having up and down movement about said horizontal pivot in a vertical arc.

2. An apparatus according to claim 1 characterized in that said shroud comprises a pair of parallel shroud plates connected together, said hammer holder, cylinder and associated parts are mounted between said plates, and upper and lower shroud hangers are operatively connected to said shroud cylinder piston rod.

3. An apparatus according to claim 1 characterized in that said shroud cylinder is suspended from the upper part of said support.

4. An apparatus according to claim 1 characterized in that said hammer cylinder is suspended from the upper part of the said shroud.

5. An apparatus according to claim 1 characterized in that a casing constitutes a part of said support, said shroud is mounted on said casing for said sliding move- 6. An apparatus according'to claim 5 characterized-in that said shroud cylinder is mounted on 7 above said casing. a p

7. An apparatus according'to claim 1 characterized in that said frame has a pair ofspaced horizontal members, a cross-member secured thereto, and sa'id support is said support mounted on said 'cross-memben V 8. An apparatus according to claim 1; characterizedin that said swing cylinder, piston and rod are in ahorizontal position and are connected to'said frame and shroudby vertical pivots for said swinging movement. a

9. An apparatus according to-claim S characterized'in that said cylinder is-pivoted to oneof said frames and shrouds and said pistontrodis pivoted'to the other.

- References Cited by the Examiner UNITED. STATES PATENTS.

9/72" Raymond 173-100 1/01-' Engstrom 173-100 12/ 17 Schumacher 2628 1124 Lodato 17310Q 1/32 7 Gettelmanf 2628 9/40 Hassler V o 173 14s 2,335,172 11/43: Cornett" 173-43 2,409,843 '10/46 Feucht- 17-3-43 2,568, 54Q', 9/5 1, Chambers 2,63 5Q855' *4/53 Gunning... 173-100 BRQUGHTQN G. DURHAM, Primary Examiner. BENJAMINHERSH; Examiner; 

1. AN APPARATUS FOR TAMPING AND OTHER PURPOSES COMPRISING A FRAME, A VERTICAL SUPPORT ON SAID FRAME, A SHROUD SLIDABLY CONNECTED TO SAID SUPPORT, A SHROUD CYLINDER ON SAID SUPPORT, A PISTON AND ROD IN SAID SHROUD CYLINDER, SAID ROD BEING OPERATIVELY CONNECTED TO SAID SHROUD, WHEREBY THE SHROUD IS MOVABLE VERTICALLY, A SWING CYLINDER HAVING A PISTON AND ROD THEREIN, SAID SWING CYLINDER AND ROD BEING RESPECTIVELY PIVOTED TO SAID SHROUD AND FRAME, SAID SHROUD BEING SWINGABLE LATERALLY ABOUT SAID SUPPORT, A HAMMER HOLDER MOUNTED ON SAID SHROUD, SAID HOLDER BEING ON A HORIZONTAL PIVOT FOR VERTICAL MOVEMENT, A BRACKET FIXED TO SAID HOLDER AND EXTENDING ON THE OPPOSITE SIDE OF SAID HORIZONTAL PIVOT FORM SAID HOLDER, A HAMMER CYLINDER HAVING A PISTON AND ROD, SAID HAMMER CYLINDER AND ROD BEING PIVOTED RESPECTIVELY TO SAID BRACKET AND SAID SHROUD, SAID HOLDER HAVING UP AND DOWN MOVEMENT ABOUT SAID HORIZONTAL PIVOT IN A VERTICAL ARC. 